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A kind of preparation method of lithium-rich manganese cathode material with high specific capacity

A positive electrode material and high specific capacity technology, applied in the direction of battery electrodes, structural parts, electrical components, etc., can solve the problems of large-scale application limitations, complex preparation process, mixed cations, etc., and achieve a narrow range of powder particle size distribution, The effect of simple preparation process and easy manipulation

Active Publication Date: 2020-10-16
XIDIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The synthesis process of the solid phase method is relatively simple, but the prepared Li 1.2 Ni 0.2 mn 0.6 o 2 Severe cation mixing, low specific capacity
Relatively speaking, the preparation process of the sol-gel method and the hydrothermal method are complex and costly, and their large-scale application is limited.

Method used

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  • A kind of preparation method of lithium-rich manganese cathode material with high specific capacity

Examples

Experimental program
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Effect test

Embodiment 1

[0059] Weigh LiNO respectively according to the stoichiometric molar ratio of 1.2:0.2:0.6 3 , Ni(CH 3 COO) 2 4H 2 O and Mn(CH 3 COO) 2 4H 2 O, where the lithium source LiNO 3 Weighing adopts 3wt% excess; the weighed LiNO 3 Dissolve in 150ml ethanol, stir magnetically at room temperature, and add Ni(CH 3 COO) 2 4H 2 O, add Mn(CH 3 COO) 2 4H 2 O, then magnetically stirred for 1h to form a green transparent solution, wherein the magnetic stirring speed was 500r / min; take polyethylene glycol PEG400, and add it dropwise to the green transparent solution, and the rate of dropping was controlled as 1 drop per second , to ensure that the molar ratio of polyethylene glycol to Li, Ni and Mn metal ions is 1:1.5, magnetically stir for 1h, and the stirring speed is 500r / min to form a green emulsion; put the green emulsion in a water bath at 75°C for 4h, At the same time, stir magnetically until a green viscous liquid is formed, the magnetic stirring rate is 350r / min, and the v...

Embodiment 2

[0063] Weigh LiNO respectively according to the stoichiometric molar ratio of 1.2:0.2:0.6 3 , Ni(CH 3 COO) 2 4H 2 O and Mn(CH 3 COO) 2 4H 2 O, where the lithium source LiNO 3 Weighing adopts 4.5wt% excess; the weighed LiNO 3 Dissolve in 180ml ethanol, stir magnetically at room temperature, and add Ni(CH 3 COO) 2 4H 2 O, add Mn(CH 3 COO) 2 4H 2 O, then magnetically stirred for 1h to form a green transparent solution, wherein the magnetic stirring speed was 550r / min; take polyethylene glycol PEG400 and add it dropwise to the green transparent solution, and the rate of dropping was controlled at 1 drop per second , to ensure that the molar ratio of polyethylene glycol to Li, Ni and Mn metal ions is 1:1.5, magnetically stir for 1.5h, and the stirring speed is 550r / min to form a green emulsion; put the green emulsion in a water bath at 80°C for 4h , and at the same time magnetically stir until a green viscous liquid is formed, the magnetic stirring rate is 400r / min, an...

Embodiment 3

[0067] Weigh LiNO respectively according to the stoichiometric molar ratio of 1.2:0.2:0.6 3 , Ni(CH 3 COO) 2 4H 2 O and Mn(CH 3 COO) 2 4H 2 O, where the lithium source LiNO 3 Weighing adopts 6wt% excess; the weighed LiNO 3 Dissolve in 200ml ethanol, stir magnetically at room temperature, dissolve evenly and then add Ni(CH 3 COO) 2 4H 2 O, add Mn(CH 3 COO) 2 4H 2 0, then magnetically stirred for 1.5h to form a green transparent solution, wherein the magnetic stirring speed was 550r / min; get polyethylene glycol PEG400 and add it dropwise to the green transparent solution, and the rate of dropping was controlled as 2 per second Make sure that the molar ratio of polyethylene glycol to Li, Ni and Mn metal ions is 1:2, magnetically stir for 1.5h, and the stirring speed is 550r / min to form a green emulsion; put the green emulsion in a water bath at 78°C 4.5h, at the same time, stir magnetically until a green viscous liquid is formed, the magnetic stirring rate is 380r / mi...

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Abstract

The invention discloses a preparation method of a lithium-manganese-enriched cathode material with the high specific capacity. The preparation method specifically comprises the steps that 1, lithium nitrate, nickel acetate and manganese acetate are dissolved in alcohol sequentially, magnetic stirring is conducted until a green and transparent solution is formed, polyethylene glycol is added into the green and transparent solution, and the solution is heated and stirred in a water bath until uniform, thick and green liquid is formed; 2, the green and thick liquid obtained in the steps 1 is poured into a crucible to generate a combustion reaction, cooled to room temperature and then ground and screened to obtain black powder; and 3, the black powder obtained in the step 2 is presinterd at low temperature, then calcinated at high temperature and cooled to obtain powder, and the powder is ground and screened to obtain the lithium-manganese-enriched cathode material with the high specific capacity. By means of the preparation method, the Li1.2Ni0.2Mn0.6O2 cathode material with the discharging specific capacity higher than 280 mAh / g can be obtained, and the coulomb efficiency of the cathode material reaches up to 95%.

Description

technical field [0001] The invention belongs to the technical field of preparation methods of new energy materials, and in particular relates to a preparation method of a lithium-rich manganese cathode material with high specific capacity. Background technique [0002] Lithium-ion secondary batteries have the advantages of high working voltage, large capacity, small size, light weight and long cycle life, and are widely used in portable electronic products, electric vehicles, energy storage and other fields. Cathode material is a key factor affecting the performance of lithium-ion batteries. In recent years, it has attracted the attention of researchers from various countries and has developed rapidly. [0003] According to the structure, the cathode materials of lithium-ion batteries are mainly divided into: (1) LiMO with layered structure 2 (M=Co, Ni, Mn) compounds, including lithium cobaltate (LiCoO 2 ), ternary nickel cobalt lithium manganese oxide (NCM) and nickel cob...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 李智敏李高锋宁涛张茂林张东岩闫养希郝跃
Owner XIDIAN UNIV
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